Research on Chemical Intermediates

, Volume 46, Issue 1, pp 429–443 | Cite as

Catalytic role of Ti dopant in boehmite for the photodegradation of rhodamine B

  • Nguyen Tien ThaoEmail author
  • Dinh Minh Hoan


Ti(IV) ions were introduced into the layered aluminum hydroxides via the precipitation of Al(NO3)3 solution and Ti(C2H5)4. Catalyst texture and structure were examined by physical techniques: X-ray diffraction, FTIR, SEM, TEM, nitrogen adsorption. Ti(IV) ions were isomorphously substituted for Al(III) species in the boehmite structure in spite of existence of a small amount of amorphous titanium oxide in some cases. The obtained catalysts have layered structure and oblate-shaped platelets with high external surface areas. They were tested for the degradation of rhodamine B (RhB) with air as an oxidant. The intra- and extra-lattice Ti(IV) ions expressed different reaction pathways for the photodegradation of RhB. While octahedrally coordinated Ti(IV) ions in hydroxide layers performed the fast de-ethylation/N-de-ethylation of RhB via consecutive steps, the extra-lattice titanium moieties underwent the slow destruction of chromophores of organic molecules. The Ti-doped boehmite catalysts gave a higher decolorization rate and a better activity in the photodegradation of RhB. The removal efficiency of RhB was obtained at 99% on Ti-intercalated layered hydroxide with molar ratio of Ti/Al = 1/5. The catalysts also expressed a good stability under reaction conditions.


Photodegradation Layered hydroxides Boehmite Promotion Ti dopant 



This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant No. 104.05-2017.04.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Faculty of ChemistryVietnam National University HanoiHanoiVietnam

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